Apparatus for preparing paving materials.



L. B. WEST.

APPARATUS FOR PREPARING PAVING MATERIALS.

' PPLlCATlON FILED 1 1 ii I l 1 I 1 I R k i 1 MM WZEZZM I i i r I)??? I%ORNEY.

Patented May 30,1916.

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L. B. WEST.

APPARATUS FOR PREPARING PAVING MATERIALS.

APPLICATION FILED MAY 16. 1913.

Patented May 30, 1916.

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WITNESSES: INVENTOR.

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L. B. WEST. APPARATUS FOR PREPARING PAVING MATERIALS.

Patented May 30, 1916.

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flbtoznm altar 1am LAWRENCE BATES WEST, OF CHATTANOOGA, TENNESSEE.

APPARATUS FOR PREJPARING PAVING MATERIALS.

My invention relates to an apparatus for.

preparing asphalt or other bituminous material for paving, and has asits principal object to utilize the heat delivered from a furnace in themost eflicient manner.

A further object of my invention is to design an apparatus adapted toheat aggregates of sand or stone and, at the same time, to liquefy anybituminous materials such as coal tar or asphalt, and also furnish asupply of steam.

A further object resides in the particular arrangement and combinationof parts hereinafter described.

Heretofore it has been customary in preparing materials for layingpavements, to employ three separate heating apparatus, one for heatingthe asphalt, coal tar, or other bituminous material, a second forheating the mineral aggregate of sand stone or other material, and thethird for creating steam power to operate the machinery in connectionwith the first mentioned apparatus, and each of the said apparatus hascommonly been furnished with a separate source of heat, either by directfire heat or steam heated coils.

In my improved apparatus I avoid the losses due to separate furnaces andproduce an apparatus which is much more compact and can be operated withless labor by utilizing an internally fired or other type of boiler,over which is placed an additional drum for containing the asphalt, coaltar, or other bituminous material so that such material may come indirect contact with the shell of the boiler, the heat transmitted fromwhich will maintain the material at a suitable temperature to allow itsmixture in the aggregates of pavement or other material. The gasescoming from the furnace of the boiler lead through a revolving drum orkiln adapted to receive and discharge the crushed stone and othermaterial used as aggregates in the construction of pavements.

In the accompanying drawings :-Figure 1 is a central, vertical,longitudinal section Specification of Letters Patent.

Patented May 3@, 1916,.

Application filed May is, 1913. Serial No. 768,081.

of an internally fired boiler incased in a tank for receiving asphalt orother material to be heated in a liquid condition. Fig. 2 is a sideelevation of the parts connecting with those shown in Fig. 1, partsbeing broken away and part of the apparatus of Fig. 1 being shown insection. Fig. 3 is an elevational view partly in section and parts beingbroken away on a somewhat smaller scale than Figs. 1 and 2 andillustrating the same apparatus shown in said figures.

In the separate views the same part is designated by the same referencecharacter.

Referring more particularly to the drawings, 1 is a boiler of theinternally fired type provided with a flue 2 in which is a furnace 3.The fine 2 connects with a combustion chamber 4; from which fire tubes 5are shown leading through the steam space 6 of the boiler to the stackhousing 7 at the front of the boiler. from the housing 7, which connectswith a separate boiler stack, (not shown) and which is provided with adamper 9. A second connection, indicated as 8 in both Figs. 1 and 2,leads from the housing 7 to an exhaust fan case 29 and is provided witha damper 9 as shown in Fig. 2. Surrounding the kiln of the boiler 1 is atank or drum 10 provided with an inlet aperture 11 at the top, intowhich the asphalt or other material to be heated may be charged. Pipessuch as 12-12 are shown leading from the bottom of the tank by which theasphalt or coal tar may be drawn from the tank 10.

The boiler 1 is provided with a suitable steam pipe 13 by which thesteam may be withdrawn for use from the steam space 6, and also feedpipes 14 by which water may be fed into the boiler. A man hole opening15 is shown connecting the steam space 6 to the interior of the housing7 and in the drawing this opening is shown open but of course inpractice it would be closed by a man hole plate such as is familiar tothe boilermakers art.

As shown at the right hand end of Fig. 1, the rear walls of thecombustion chamber 4 and the boiler shell 1 are apertured and flanged soas to provide a passage 16 through which gases may pass from the chamber4:. As shown in Fig. 2, passage 16 is covered by a fixed flue orcylinder 17 which is provided with an opening or outlet spout 18 fromthe bottom. Gases coming from the furnace 3 pass through the cham- Astack connection 8 leads her 4 and passage 16, into the fine 17 and theninto a revolving drum or kiln 19. The end of the flue 17 removed fromthe boiler is extended outside of the left end of the drum 19 and thelatter is provided with an angle iron 20 which projects outwardly nearthe end of the flue 17, so as to prevent the escape of gases andmaterial at the point of connection between the two. At the end of thedrum 19, opposite the this 17, is a second fixed fine 21 having an inlet22 through which material is fed into the spout 22 from which it passesinto the drum 19.

' of connection between the two.

The drum 19 is provided with an apertured head 210 through which spout22 extends and head 210 carries a ring 211 provided with a projectingtongue which fits within a groove in a ring 212 fixed within the end ofthe flue 21, so as to prevent the loss of material and escape oi": gasesat the point Intermediate itsends, the drum 19 is provided with a gear23 which is fixed'to its exterior surface and meshes with adrivingpinion 24 carried by shaft 25 which is mounted in suitablebearings such as 26. The driving pinion 24 is driven by an engine 27which is connected thereto by means of suitable in termediate gearing asshown. The drum 19 carries also on its exterior two tires such as 231and 232 which are supported on suitable V trunnions 233 and 234,respectively, said trunnions being mounted'in suitable bearings such as235 235 and 23623(3 by which the weight of the drum.19 is supported. It

" will be apparent from Fig. 2 that the interior of the'drum 19 isprovided with'long'itudinally extending flights. The steam pipe 28 ofthe engine 27 may be connected to the boiler steam. pipe 13. The flue 21connects With a casing 29 by means of an extension 21 and thelatterconnects in turn 31, there will be no tendency for boiler gaseswith the fan case 29. A fan 31 is indicated within the casing 29 indotted lines and a small steam turbine 32, or other suitable drivingmeans is provided for running the fan 31, the steam pipe 33 of theturbine or other motor being preferably connected to the steam pipe 13of the boiler 1. A damper 34 is provided between. the flue 21 and case29 and'serves to regulate the flow of gasesthrough 21*. It will beapparent that becausebf the suction produced bythe fan to pass outthrough the-outletv 18 or the-inlet 22 for the aggregate material; r

It will bennderstood that in the operawhich is driven by steam derivedfrom the boilerl and the fan 29 is also driven by steam from the samesource. Crushed stone, sand and other material for use in the pavementis fed into the apparatus at 22 and passing through thedrum 19 is heatedby the gases from the furnace 3, being withdrawn from the apparatus at18. Said aggregate forming material is fed into the inlet 22 from timeto time as desired, and liquid is withdrawn from the tank 10 to mixtherewith when needed. The dampers 9 and 34 are-then regulated asdesigned so as to maintain a proper supply of steam in the boiler andalso heat the material for the aggregate to the desired temperature. It

will be understood that if no material is being fed through the drum 19,the damper 34 may be closed and all of the gases sent through theconnection 8 on the way to the,

stack whereby a high pressure of steam and a large supply of hot Watermay be accumulated and then when the material is to be heated by thedrum 9, the dampers may be manipulated so as to send the majority of thegases from the furnace through the drum 19 and the heat stored in theboiler may be drawn upon to maintain the operation of the drum and fan.Of course, it will be understood that when the material is being passedthrough drum 19 in practically continuous succession, the damper 9 willneed to be adjusted to maintain the average flow of gases through thetubes 5 needed to maintain the required steam pressure, but frequentlythe operation of the drum 19 is more or less'intermittent. Thus it willbe seen that by my apparatus I am able to furnish steam for operatingthe revolving kiln or other necessary apparatus for the preparation ofpaving material, and, at the same time,'heat asphalt and the materialsbeing prepared by the use of only one furnace. Consequently, the entireoperation requires the service of only one attendant to oversee theapparatus.

It will also be evident that my improved apparatus may be applied toeither the construction of sheet asphalt, bituminous concrete or anyother form of pavement wherein asphalt, coal tar, or any other form ofbituminous material is used in connection with sand, carbonate of lime,stone, or other form of mineral aggregate, and that my apparatus hasmany advantages of economy in construction and in the production of thepavement.

It will be evident that my apparatus can be applied to other methods ofoperation or for'tlie drying of sand in the manufacture of plaster andother purposes wherein a power and drying furnace is used in connectionwith the operation of the same.

It will be understood that while I have described and shown thepreferred form of my invention, certain changes and modifications may bemade therein without departing from the spirit of my invention. I

Having thus described my invention, what I claim is 1. In an apparatusof the class described in combination, a boiler provided with a furnaceand having a combustion chamber, a smoke box for said boiler, fire tubesconnecting said combustion chamber and said smoke box, said box beingprovided with a stack connection, a damper for regulating the flow ofgases through said tubes, a rotary kiln, connections between saidcombustion chamber and said kiln for introducing furnace gases into thelatter, a stack to which said kiln is connected, and a damper forregulating the flow of gases through said kiln.

2. In an apparatus of the class described in combination, a boilerprovided with a furnace and having a combustion chamber, a smoke box forsaid boiler, fire tubes connecting said combustion chamber and saidsmoke box, said box being provided with a stack connection, a damper forregulating the flow of gases through said tubes, a rotary kiln,connections between said combustion chamber and said kiln forintroducing furnace gas into the latter, a stack to which said kiln isconnected, a damper for regulating the flow of gases through said kiln,and a tank connected to the exterior of said boiler.

3. In an apparatus of the class described in combination, a boilerprovided with a furnace and having a combustion chamber, a smoke box forsaid boiler, fire tubes connecting said combustion chamber and saidsmoke box, said box being provided with a stack connection, a damper forregulating the flow of gases through said tubes, a rotary kiln,connections between said combustion chamber and said kiln forintroducing furnace gases into the latter, a stack to which said kiln isconnected, a damper for regulating the flow of gases through the kiln, atank connected to the exterior of said boiler, a motor for rotating saidkiln, and a steam connection between said boiler and said motor.

4. In an apparatus for preparing paving material in combination, acylindrical steam boiler, a furnace for said boiler, and an asphalt tankarranged on the exterior of said boiler and concentric therewith.

5. In an apparatus for preparing paving material in combination, acylindrical return tubular boiler having a furnace therein, and anasphalt tank carried on the ex terior of said boiler and concentrictherewith.

6. In an apparatus for preparing paving material in combination, acylindrical return tubular boiler having a furnace therein, an asphalttank attached to the exterior of said boiler and concentric therewith, arotary kiln, connections between said furnace and said kiln forintroducing furnace gases into the latter, a motor for revolving saidkiln, and steam connections between said motor and said boiler.

In testimony whereof I aflix my signature in the presence of twowitnesses.

LAWRENCE BATES WEST.

Witnesses:

VVALLAGE C. BATHMAN, A. S. MCLUNDIE.

Gopies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents, Washington. D. G.

